US2562921A - High power ultra high frequency load device - Google Patents

High power ultra high frequency load device Download PDF

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Publication number
US2562921A
US2562921A US582153A US58215345A US2562921A US 2562921 A US2562921 A US 2562921A US 582153 A US582153 A US 582153A US 58215345 A US58215345 A US 58215345A US 2562921 A US2562921 A US 2562921A
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US
United States
Prior art keywords
cavity
high frequency
load device
ultra high
impedance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US582153A
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English (en)
Inventor
Armig G Kandoian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE469698D priority Critical patent/BE469698A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US582153A priority patent/US2562921A/en
Priority to CH261005D priority patent/CH261005A/de
Priority to GB7323/46A priority patent/GB609193A/en
Priority to FR923532D priority patent/FR923532A/fr
Priority to ES0173059A priority patent/ES173059A1/es
Application granted granted Critical
Publication of US2562921A publication Critical patent/US2562921A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices
    • H01P1/26—Dissipative terminations
    • H01P1/266—Coaxial terminations

Definitions

  • This invention relates to ultra high frequency systems and more especially to power dissipating or load devices for such systems.
  • a principal object of the invention is to provide an improved tunable load device for high frequency systems to enable the device to dissipate large amounts of power at highy frequencies.
  • ⁇ Another object is to provide a load device employing a resonant cavity which can be used as a terminating or dummy impedance for ultra highfrequency transmission lines.
  • a feature of the invention relates to an improved dummy load or power dissipating device for high frequency transmission lines, which device is of rugged construction and can provide simpler and better impedance matching control to the transmission line over a relatively wide frequencyrange, especially at ultra high-frequencies.
  • Another feature relates to a power dissipating device suitable for ultra high-frequency systems employing highly resonant transmission lines,
  • a further feature relates to a terminating imand interconnection of parts which constitute a simple, ruggedand easily adjustable resonant cavity load device for high frequency transmis- Sionlipes and. the11ke.
  • Fig. 1 shows vone form of device according to the inventionwith direct coupling between the transmission ⁇ line and the resonant cavity;
  • Figs. 2 and 3 are alternative forms of Fig. 1 showing respectively inductive coupling and capa-city coupling between the transmission line and the resonant cavity;
  • Figs. 4 and 5 represent further embodiments of the invention.
  • the invention contemplates a tunable ultra-frequency resonant cavity which is connected to a highly resonanttransmission unit effective at ultra high-frequencies.
  • the cavity is so designed and adjusted that radio frequency power from the line is transmitted into the cavity and is dissipated within the cavity in the form of heat. This is accomplished'primarily by tuning the cavity to resonance and coupling the line to a part thereof having an impedance characteristic substantially equal Ato the surge impedance of the transmission line.
  • the coupling is designed and adjusted so that the input impedance of the resonant cavity looking from the transmission line toward the cavity, is substantially a pure resistance and equal to the surge impedance of the transmission line. Under this condition, radio frequency power can be fed into the cavity from the lineand this power is dissipated in the cavity losses.
  • two limitations are existent in the amount of p ower .that
  • The. deviceac-cording to the invention provides an ⁇ eflicient and ruggedarrangement for meeting both these limitations.
  • a coaxial cavity device comprising an outer casing I of iron, brass or other suitable metal, and an inner coaxially supported thin-walled metal tube 2.
  • - member 2 is of a metal or alloy which has a high metals are iron, nickel, Kovan Nichrome,
  • Members I and 2 therefore form a coaxial resonant cavity of which member 2 is the central conductor and member I is the surrounding or enclosing conductor.
  • the member 2 is provided with a plunger 4 which is attached to a shank 5 having an adjusted knob 6 on its exterior end.
  • Shank 5 is threaded and engages the corresponding threaded opening in the cover 3.
  • the high frequency transmission line may be of highly resonant coaxial type, the center conductor 8 being directly connected to member 2, while the outer pipe or sheath 9 is brazed or threaded to the casing I at the opening III.
  • Line 1 is shown schematically connected to a source II of high frequency power of any well-known kind.
  • the tunable dissipating cavity formed by members I, 2 and 4 Since the tunable dissipating cavity formed by members I, 2 and 4 is closed, its normal heat radiating properties are comparatively high and will therefore dissipate a considerable amount of heat. This heat is generated primarily in the member 2 which, in accordance with the invention, is purposely made of thin gauge metal stock. If desired, suitable head radiating i'lns I2 or the like can be attached to the outer Surface of member I, and additionally a fan or blower may be used to cool member I. Furthermore water cooling may be used on member 2 to carry off the heat generated in this member.
  • the voltage V for a given amount of power W may be reduced by reducing the Z0 or Q of the circuit.
  • the latter is by far preferable because it also makes the circuit less critical to adjust-and less critical with frequency.
  • the Q may, of course, be reduced by employing high loss materials, such as iron, nickel, Kovan Nichrome, etc. as above noted.
  • Another very elective way of reducing the danger of voltage breakdown is to use oil dielectric within the cavity. This will increase the value of voltage at which breakdown will occur by a large factor-e. g. to l0 or more.
  • the presence o f the oil will help the problem in two other ways also, first by increasing the losses in the circuit (by reducing the Q) and second by reducing the size of the cavity because of the increased dielectric constant compared to air.
  • the impedance at any point 0 along the center conductor 2r is a pure resistance given approximately by If for example the line I is a 50 ohm line, and the cavity dissipating unit is to be matched thereto, the value 050 corresponding to the angular length 0 to give 50 ohms pure resistance may be solved as follows:
  • Z0: 50-'-ZQ sin2 050 (3) 50 2 YS111 50-Z0Q Zo and Q may be determined by routine measurement and by the dimension of the center and outer conductor.
  • connection may bedirect 01 a loose coupling made depending upon the single impedance of the line and the structures of this resonant cavity device.
  • Fig. 1 From the above relationship one .can determine how much mismatch to expect as the frequency deviates but always keeping the cavity at resonance by a simple tuning arrangement such as that shown in Fig. 1. It can be seen that the frequency may be Varied before the mismatch will exceed 2:1 on the feeding transmission line '1. If better match is required over that or larger frequency range one more control in addition to the tuning control is desirable. A simple diode, crystal or neon indicator may be used to determine the resonant point for any frequency in the well-known manner.
  • Fig. 2 there is shown a device similar to Fig. 1 with the exception that the coaxial line conductor 8, instead of being'directly coupled to the cavity is inductively coupled by means of the small inductive loop I3.
  • Fig. 3 shows another embodiment wherein the coaxial line conductor 8 is coupled to the cavity electrostatically by means of the small condenser plate I4 which is in spaced relation to the member 2.
  • the coaxial cavity comprises a metal container I5 and a thin-walled coaxially mounted tube I6, which is adjustably threaded through the cover I'I, so as to vary the length of the member I6 within the member I5.
  • the container I5 is provided with a filling of oil I8, the level of which isbelow the opening to which the coaxial line I9 is connected.
  • the container I5 may be provided with an oil level indicating 20, and is arranged to be cooled by immersion within a water bath 2l which is supplied withrunning Water through the inlet and outlet pipes 22, 23.
  • the oil within the cavity reduces the danger of voltage breakdown by a factor of at least 5 to 1 0 and also increases the loss characteristic of the cavity by reducing the Q thereof. It will be understood, of course, that oil may be used in the embodiments of Figs. 1, 2 and 3, in which event the size of the cavity may be reduced for the same amount of loss introduction, because of the increased dielectric constant of oil as compared with air.
  • the central thin-walled metal conductor 24 is a reentrant or U-shaped tube so as to provide a through path for the flow of cooling water therethrough.
  • the tuning of the cavity is effected by adjusting the electrostatic capacity between the central cavity conductor 24 and the bottom 25 in any suitable way.
  • a variable condenserl 26 may be connected between the'conl ductor 24 and the bottom of the cavity 25.
  • Some mechanical means as indicated diagrammatically at 21 may be used to perform this adjustment.
  • the highly resonant coaxial transmission line 28 has its central conductor 29 connected to cavity member 24, and the outer pipe or sheath 30 is connected to the outer member or casing 3
  • a power dissipating device for high frequency transmission systems comprising means defining a high frequency resonant cavity provided with one or more walls of metal having pronounced loss characteristics at high frequencies, means for tuning said cavity to resonance, a transmission line having a given surge impedance, and means including an inductive loop coupling said transmission line to a point in said cavity having an impedance characteristic corresponding substantially to the surge impedance of said line.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Plasma Technology (AREA)
  • Electrotherapy Devices (AREA)
US582153A 1945-03-10 1945-03-10 High power ultra high frequency load device Expired - Lifetime US2562921A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE469698D BE469698A (xx) 1945-03-10
US582153A US2562921A (en) 1945-03-10 1945-03-10 High power ultra high frequency load device
CH261005D CH261005A (de) 1945-03-10 1946-03-07 An eine Übertragungsleitung für Hochfrequenzenergie angekoppelte Belastungsvorrichtung.
GB7323/46A GB609193A (en) 1945-03-10 1946-03-08 High-power ultra-high-frequency load device
FR923532D FR923532A (fr) 1945-03-10 1946-03-09 Perfectionnements aux systèmes à très haute fréquence
ES0173059A ES173059A1 (es) 1945-03-10 1946-03-30 Mejoras en dispositivos de carga para sistemas de alta potencia a frecuencias ultraelevadas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US582153A US2562921A (en) 1945-03-10 1945-03-10 High power ultra high frequency load device

Publications (1)

Publication Number Publication Date
US2562921A true US2562921A (en) 1951-08-07

Family

ID=24328052

Family Applications (1)

Application Number Title Priority Date Filing Date
US582153A Expired - Lifetime US2562921A (en) 1945-03-10 1945-03-10 High power ultra high frequency load device

Country Status (6)

Country Link
US (1) US2562921A (xx)
BE (1) BE469698A (xx)
CH (1) CH261005A (xx)
ES (1) ES173059A1 (xx)
FR (1) FR923532A (xx)
GB (1) GB609193A (xx)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748354A (en) * 1950-05-31 1956-05-29 Gen Electric Wide band television tuning circuit
US2825874A (en) * 1954-03-03 1958-03-04 Itt Artificial load for broad frequency band
US2866950A (en) * 1955-05-31 1958-12-30 Rca Corp Microwave power measurement device
US2907963A (en) * 1954-11-26 1959-10-06 Hoffman Electronics Corp Multi-channel antenna couplers or the like
US2925477A (en) * 1957-09-12 1960-02-16 Radiation Inc Radio frequency amplifier
US2943284A (en) * 1954-04-08 1960-06-28 Raytheon Co Methods and structures for control of microwave propagation
US2977551A (en) * 1957-03-18 1961-03-28 Nat Res Dev Microwave modulator
US3001151A (en) * 1957-03-15 1961-09-19 Nat Res Dev Electromagnetic wave modulating devices
US4730174A (en) * 1983-05-10 1988-03-08 Murata Manufacturing Co., Ltd. Dielectric material coaxial resonator with improved resonance frequency adjusting mechanism
EP0392372A2 (en) * 1989-04-10 1990-10-17 Alcatel N.V. TEM coaxial resonator
US5621367A (en) * 1993-05-13 1997-04-15 Nokia Telecommunications Oy Coaxial resonator comprising slits formed in the inner conductor
EP0806807A2 (en) * 1996-05-07 1997-11-12 ADC Solitra Oy Coaxial filter
US20050253673A1 (en) * 2004-05-15 2005-11-17 Peter Killer Coaxial resonator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528343C2 (de) * 1995-08-02 1997-05-22 Markus Muehleisen Vorrichtung zur reflexionsarmen Absorption von Mikrowellen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2124029A (en) * 1935-06-08 1938-07-19 Rca Corp Frequency control line and circuit
US2160655A (en) * 1933-10-04 1939-05-30 Rca Corp Oscillation generation and control
US2175710A (en) * 1938-01-06 1939-10-10 Rca Corp Variable coupling arrangement
US2222644A (en) * 1937-01-21 1940-11-26 Rca Corp Concentric lines and circuits therefor
US2235521A (en) * 1939-07-26 1941-03-18 Bell Telephone Labor Inc Frequency indicator
US2236004A (en) * 1938-07-30 1941-03-25 Rca Corp Ultra high frequency signaling system
US2262134A (en) * 1938-08-31 1941-11-11 Rca Corp Ultrahigh frequency transmission line termination
US2389167A (en) * 1940-06-21 1945-11-20 Int Standard Electric Corp Lecher wire system
US2399930A (en) * 1942-05-16 1946-05-07 Gen Electric Energy dissipator
US2400976A (en) * 1941-04-19 1946-05-28 Westinghouse Electric Corp Resonator
US2402663A (en) * 1942-04-11 1946-06-25 Bell Telephone Labor Inc Thermoelectric device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160655A (en) * 1933-10-04 1939-05-30 Rca Corp Oscillation generation and control
US2124029A (en) * 1935-06-08 1938-07-19 Rca Corp Frequency control line and circuit
US2222644A (en) * 1937-01-21 1940-11-26 Rca Corp Concentric lines and circuits therefor
US2175710A (en) * 1938-01-06 1939-10-10 Rca Corp Variable coupling arrangement
US2236004A (en) * 1938-07-30 1941-03-25 Rca Corp Ultra high frequency signaling system
US2262134A (en) * 1938-08-31 1941-11-11 Rca Corp Ultrahigh frequency transmission line termination
US2235521A (en) * 1939-07-26 1941-03-18 Bell Telephone Labor Inc Frequency indicator
US2389167A (en) * 1940-06-21 1945-11-20 Int Standard Electric Corp Lecher wire system
US2400976A (en) * 1941-04-19 1946-05-28 Westinghouse Electric Corp Resonator
US2402663A (en) * 1942-04-11 1946-06-25 Bell Telephone Labor Inc Thermoelectric device
US2399930A (en) * 1942-05-16 1946-05-07 Gen Electric Energy dissipator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748354A (en) * 1950-05-31 1956-05-29 Gen Electric Wide band television tuning circuit
US2825874A (en) * 1954-03-03 1958-03-04 Itt Artificial load for broad frequency band
US2943284A (en) * 1954-04-08 1960-06-28 Raytheon Co Methods and structures for control of microwave propagation
US2907963A (en) * 1954-11-26 1959-10-06 Hoffman Electronics Corp Multi-channel antenna couplers or the like
US2866950A (en) * 1955-05-31 1958-12-30 Rca Corp Microwave power measurement device
US3001151A (en) * 1957-03-15 1961-09-19 Nat Res Dev Electromagnetic wave modulating devices
US2977551A (en) * 1957-03-18 1961-03-28 Nat Res Dev Microwave modulator
US2925477A (en) * 1957-09-12 1960-02-16 Radiation Inc Radio frequency amplifier
US4730174A (en) * 1983-05-10 1988-03-08 Murata Manufacturing Co., Ltd. Dielectric material coaxial resonator with improved resonance frequency adjusting mechanism
EP0392372A2 (en) * 1989-04-10 1990-10-17 Alcatel N.V. TEM coaxial resonator
EP0392372A3 (en) * 1989-04-10 1992-01-15 Alcatel N.V. Tem coaxial resonator
US5621367A (en) * 1993-05-13 1997-04-15 Nokia Telecommunications Oy Coaxial resonator comprising slits formed in the inner conductor
EP0806807A2 (en) * 1996-05-07 1997-11-12 ADC Solitra Oy Coaxial filter
EP0806807A3 (en) * 1996-05-07 1998-07-29 ADC Solitra Oy Coaxial filter
US20050253673A1 (en) * 2004-05-15 2005-11-17 Peter Killer Coaxial resonator

Also Published As

Publication number Publication date
GB609193A (en) 1948-09-27
FR923532A (fr) 1947-07-09
ES173059A1 (es) 1946-05-01
CH261005A (de) 1949-04-15
BE469698A (xx)

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